The latest threat was sent to the school Sunday night, but the school was open on Monday.
Orange High School parents attended Monday night's school board meeting with comments and questions. FBI special agent Scott Wilson gives them an update as investigators try to find the person behind more than a dozen bomb threats sent to the school.
"Do you feel it is a student or could it be someone, you know, maybe not necessarily outside the system, but an adult inside the system?" asked one parent.
"We don't believe the person that is making the threat can carry out what they're saying in the emails, so even though we say it's not credible, we still look at it as very serious," said Wilson.
The first e-mailed threat was sent November 6th, forcing the school to shut down for three days. Classes have resumed under tighter security. But the emails keep coming, some threatening to harm students and staff with biological agents. Sunday night's email threatened to blow up the school with backpack and cell phone bombs.
"Unfortunately, the person or persons that are sending these threats are masking their emails, are using some pretty high technology ways of sending these emails where we're having difficulty tracking the emails," said Wilson.
"To send my son here has been very difficult, to see that a 16, 17 or 15 years old is running circles around the FBI is disturbing," said another parent.
Monday, Orange High students were banned from bringing backpacks or cell phones to school. Officials say they will ease that restriction Tuesday, but will keep restrictions regarding how they enter and exit the building. Many parents say the chaos is affecting their children.
"Upset stomach, things like that, just the stress of the day in school just to finish your every day assignments, and to have this on top of it does disrupt school and it makes it difficult on them to go through the day," said parent Melinda Bilfield.
Scott Wilson says each e-mail is analyzed by the FBI office in Quantico, Virginia. He believes someone is holding back information that could help identify the person making the threats.
Anyone with information is asked to call Pepper Pike police or the FBI.